On the Origin of Diastereoselectivity in [2 + 2 + 2] Cycloisomerization of Chiral Triynes: Controlling Helicity of Helicene-like Compounds by Thermodynamic Factors
作者:Petr Sehnal、Zuzana Krausová、Filip Teplý、Irena G. Stará、Ivo Starý、Lubomír Rulíšek、David Šaman、Ivana Císařová
DOI:10.1021/jo701997p
日期:2008.3.1
selected helicene-like compounds were measured indicating their lower configurational stability in comparison to the parent carbohelicenes. Free energy differences between corresponding pairs of diastereomers (calculated at the DFT B3LYP/TZV+P level) were in excellent agreement with the experimental data and allowed for the prediction of the stereochemicaloutcome of the reaction. An optically pure hexacyclic